Wurzel



H. WURZEL 2,733,872

DRIVING MEANS FOR ROLLS, SPOOLS, AND THE LIKE Feb. 7, 1956 2Sheets-Sheet 1 Filed Jan. 6, 1954 FIG. 2

FIG.

.IIIIIIIIIIAI fi l I I FIG. 4

FIG. 3

INVENTOR HUGO WURZEL ATTORNEY Feb. 7, 1956 H. WURZEL 2,733,872

DRIVING MEANS FOR ROLLS, SPOOLS, AND THE LIKE Filed Jan. 6, 1954 2Sheets-Sheet 2 FIG. 5

FIG. 6

INVENTOR HUGO WURZEL ATTORNEY United States Patent Long Island City, N.Y., a corporation of New x Application January 6, 1954, Serial No.402,519 1 Claims. (Cl. 242-11 This invention relates to improvements indriving means forrolls, spools and the like, and more particularly to adriving means of the type adapted to be interposed between the'film-wind knob and the film-rewind roll of a loaded camerafor driving theroll so as the wind up the film following each exposure thereof.

A general object of the invention is the provision of a drivingmeans ofthe stated type characterized by simple andinexpensive construction andwhich at the same time is positive in its action and thoroughlydependable in operation. I

Another object of the invention is the provision of a driving means asaforesaid, which may itself be simply assembled and, disassembled, aswell as one permitting easy and quick coupling and uncoupling of thefilm roll therewith. i I 3A more particular object of the invention isthe provision of a driving means for a camera film roll of the typeemploying a key shaft turnable by a film wind knob mountedexternally ofthe camera case and a driving key carried by the key shaft and adaptedto be cooperated with the film roll, wherein the driving key is in theform of a web, ,as distinguished from a pin, and is detachably yeteffectively secured within ,aslot provided in the key shaft by a springretaining ring seated in a groove thereforealso provided in the keyshaft.

' A further object of the invention is the provision of a film roll'driving. means as last above characterized, wherein the springretaining ring is operative to secure the web. key against both axialand radial separation from the key shaft.

Thelabove and other. objects and advantages of a film roll: drivingmeans according to the invention will appear fromthe following detaileddescription thereof, in which reference is made to the accompanyingdrawings, illustrating apreferred physical embodiment thereof, whereinFig. l is a view, partly in section, looking into the film roll space ofan opened camera case, which illustrates a driving means for driving.the film roll contained in said space through a film wind knob mountedexternally ofithe camera case;

FEigfZis aview similarto Fig. 1,, but with the film wind knob andassociated parts turned throughout an angle of 90;

Fig. 3 is a side elevation of the key shaft constituting one componentof the driving means of the invention, with key omitted;

Fig. 4 is a front elevation thereof;

Fig. 5 is a side elevation of a web-form of driving key according to theinvention;

Fig. 6 is a front edge view thereof;

Fig. 7 is a view looking into the head or driving end of the key shaftwith key assembled thereon and secured by a spring retaining ring; and

Fig. 8 is a view similar to Fig. 1 but with all parts shown in sideelevation.

Referring to the drawings, reference numeral 10 designates the frame orbody of a camera case, and more par- 2,733,872 Patented Feb. 7, 1956"ice 2 ticularly the frame portionwhich defines and end of the film-rollspace into which a film rewind roll 11 is inserted. As is usual, theroll 11 is adapted to be driven manually by a knob 12 mounted externallyof the camera case and whose under face bears on a wear collar 13aflixed to the outer face of said case.

According to the invention, the knob is aflixed by suitable means (notshown) to the outer end of a key shaft 15 of length to extend from theknob through the frame 10 and to project a short distance into the filmroll space. As best seen in Fig. 3, the key shaft has a large diameterportion 16, a neck portion 17 of lesser diameter resulting in theformation of a shoulder 18, and a smaller.

diameter driving end or head portion 19 spaced axially from the neckportion by a groove 20. By reference to Fig. 2, the larger portion 16 ofthe key shaft extends into a closely fitting opening 22 providedthereforin the frame 10, the cylindrical wall surface of said openingthus providing a bearing for the key shaft. The shoulder 18 is solocated axially in said opening thatit serves as an abutment for aninternal flange 23 formed on said frame to extend about the shaftopening at its inner end, the smaller diameter opening defined by saidflange accommodating the neck portion 17 of the key shaft. Thus, theframe flange 23 and shaft shoulder 18 cooperate to locate the key shaftin one axial direction, i. e, by preventing inward movement of the keyshaft beyond an axial position in which its shoulder engages said frameflange.

According to a further feature of the invention, the key shaft 15 isprovided with a diametrical slot 24 cut through the head and neckportions and extending well into the large diameter portion thereof, andalso intersecting the shaft groove 20. Such slot provides for thereception of a web key 25 which, as shown in Figs. 5 and 6, is flat andgenerally rectangular in shape, whereby it may be stamped from sheetmetal and hardened. As best seen in Fig. 5, the key has adriving or headend 25a of appreciably greater width than the diameter .of the headportion 19 of the key shaft and a seating end 25b of lesser width andwhich is adapted to extend into the portion of the slot 24 cuttingthrough the large diameter portion 16 of the key shaft. In its widerend, the key is provided with opposite edge slots 26a, 26b which arespaced outwardly from its front end edge a distance corresponding to thedistance that the key shaft groove 20 is spaced from the end face of thekey shaft. Moreover, the slots 26a, 26b have width corresponding to thewidth of the key shaft groove 20, and their depth is such that the widthof the key between the bottom of the slots corresponds to the diameterof the circle of the bottom of said shaft groove, although such widthdimension may be slightly greater than said diameter. It will also beobserved that the wider and narrower ends of the web key 25 are definedone from the other by opposite shoulders 27a, 2711 which are spaced aslight distance from the slots 26a, 26b and are preferably rounded asshown. As seen in Fig. l, the shoulders 27a, 27b, following finalassembly of the key 25 in the key shaft groove 24, are adapted to abutloosely on the inner wall of the frame flange 23, thus to locate the keyshaft in the other axial direction, i. e. prevent its outward movement.

A web key as described is adapted to be secured against axial and radialseparation from the key shaft 15 by means of a spring retaining ring 28,preferably a so-called E ring as disclosed in United States Patent No.2,411,761, dated November 26, 1946. Such a ring is of the open type,that is to say, a large gap is provided between its open ends wherebythe ring may be assembled in its groove by simple radial deformation,and it is provided with middle and end lugs or protrusions 28a, 28b,28c,

off the ring body, the-lugs terminating in inner arcuate edges which lieon a circle of somewhat smaller diameter than that of the circle ofthebottom ofthe groove in which the ring seats, whereby, when assembled inits groove, the ring secures itself. with spring pressure.

Thus, accrding-;to-.the invention,- a web key. such. as the key,25 maybe locatedfandsecured to thekey shaft 1'5fsi1'nplyby inserting thenarrow end 25b of the key shaft into the shaft slot .24 to a depth suchthat the key slots 26d, 26b line up with theshaft grooveliiandthereupon. .assemblingfthe retainingring- 225 in said groove in the:usual "manner... Dining suchassembly, at least the ring ,end.1ugs,.-28b,.z cmove into thekey slots 26a, Zeb and tlfiereby securely lock the keyin operating position tosth'e.keylshaft.- WhenLit-isdesired to removethe key fr'on'uthe keysh'aft for repair-or replacement purposes, suchmaybefited simply by disassembling the retaining ring 28! from the shaft.groove 20 in the usual manner, whereuppnthe key may. besimply withdrawnfrom the key,slot 24..- Itis' a further feature of the invention thatupon.:removahbfihblkey from the'keyshaft the entire keyshaftassemblymaybe difassernbled from the camera simplyjbypull exerted on theknobll lDiie to the-.Widthlof the .widehendZsa of the Web keybeing,..greater.tlian the diameter of the head end 19- of the key.shaft,..the side. edges of the key extend radially from the-latter,as-shown inFigs. 7 and Such extend ing,,si'de'. edges serve asdiametrically! opposed driving Wingsaprojecting radially from thedriving or head end of the key .shaft andfare.thus capable of driving amember proyidedtwithlasuitably shaped key-hole which is cooperatedtherewith; r i

' Referring to Fig. l, the end disc 11:: of the filr'n roll 1ftis-provided .with a key-hole 11b shaped complementally to.the-head end19 of. the keyshaft and the aforesaid driving wings,providedthereon bythe extending side edgesofth'e key 24. Thus, the film roll may besirnplycoupled .to the key shaft by moving it to a position such th'atth'edriving end of the key shaft enters the key hole llb'whereupon. the rollmaybe driven by manual rotation of theknob 12, and uncoupling of thefilm roll may be eifcted "in equally simple manner merely by moving theroll axiallyaway from the key shaft.

Without further analysis, it will be seen that the film roll. drivedescribed above achieves the objectives there for outlinedin theforegoing. That isto say, the webfojrmdriving key employed in such adrive gives more positive action than the'prior pin-form driving key,and it's' -,construction, as well asthat of the key shaft, is such thatit 'rnay beassembled with the key shaft and disassembledfth'erefr'om.in. exceedingly simple manner. Moreover, a.drivi1igmeans according tothe present invention,

is'capable of 'bein'g assembledand disassembled as a Wholev from thevcamera,.thus permitting easy repair andlo'r, replacement. when such isrequired. Finally, the driving; means. ofithe invention may beinexpensively manufactureiand its initial assembly costs are low ascomparedito those involved-with prior film roll driving means;

As -many'changes could be made in carying out the above constructionwithout departing'trom th'c scope of the invention, it is intended thatall matter contained in the above description or shown in'theaccompanying drawings shall be interpreted as illustrative and not in alimiting sense.

I claim:

1. Means for driving .acamera film roll from a film wind knob mountedexternally of the camera comprising, in combination-,a key shafteXtending'throIigI'i an opening in the frame and 'being'affixed at itsouter end to said knob, the: key a shaft beingsprovided adjacenbzitfiinner end with a circular groove and: having;a:diametri al through slotintersecting said groove, a web-formifldriw ing key received in saidslot, and an open=endedspring retaining ring seated 'in' said groove and'co'acti'tig' with said key to secure itagainstbothaxialand radialdisplacement.

2. Driving means as set forth in claim 1, wherein said key is providedin its; opposite: edgest-witlrzslots shaped and positioned so as .toregist'errwithsaidigtoove" and through-whichthe ring .extends.:.

3. Driving: means asset forthfinclaim ikqwhcreintsaildt key shaft andsaid keyare eachtprovidediwith: means which operate conjointly to securethe' keytsliaft againsv axial displacement.

4. Driving meansas set forth.int-claim;l,z whereimisaidr key shaft andsaid key are provided! withi'facingfishouli ders providing axiallyspacedabutmentslfor meanst'on; the frame, said abutment means preventingaxitilfidi'splacement of the'key shaftrelative to frame.

5. Means for drivinga camerazfilm rollxfromcai film' w'md knob mountedexternally. ofithecamerafcomprisingg in combination, a. key shaftfextendingithrough an op'en ing in the frame and being affixed at itsouter end'tfiisaid" knob, the key shafthaving ai large diameterouter endportion separated "from .a smallerfrdiameter'inner portion by a shoulderlocated near the inner-- endofi saidlopening and which abuts the outerside of an- 'internal frameflange extending along sai'd openingtatits'inner endf' the inner end portion of the key shaft=beingprovidd"with" acircular groove and 'both said outer-and 'innenend portions having adiametrical slot cutting throughsnid groove, a web-form key receive'd insaidslotand havin'g one end portion of greater width than thedi'ametefofsaid inner end portion whereby its side edg'esext'end radiallytherefrom, the other end portion ofsaidkey -'ex"- tending into and beingcontainedwitliim-the' circum ference of the largerdiameter end ofthe-keyshaft', said radially extending side edges of the key beifigprovided with opposite slots disposed in registry 'witlfitliefgroove, aspring retaining ring seated 'in" the-groover'andpassing through 'said'opposite slots, said radiallywxtendlii'gfstde edges terminating inoutwardly" facing shbulderfwlficlf abut the inner 'side'of saidinternal'framefianger References Citedhthefilmfthid'patent UNITEDSTATESQP'ATENTSI.

